HP 3000 Manuals HP 3000 Manuals
Appendix G UPS and UPS Monitor/iX Software
A new method of power failure protection is available on the HP 3000
Series 991 and 995 computer systems and the Series 9X8 systems. Instead
of battery backup units, they will have one or more HP model A2998A
PowerTrust UPS (Uninterruptible Power Supply) devices.
Like the battery backup method of power failure, the UPS devices protect
the HP 3000 system against the loss of work in progress in cases of
utility AC power failures of up to fifteen minutes in duration.
Furthermore, they have been designed to appear similar to the battery
backup method which minimizes their effect on system operation and
management procedures.
UPS devices offer two principal advantages over the battery backup
method:
* In a minimal UPS-based system, the degree of power failure
protection is equivalent to that provided by the battery backup
unit. You can, however, add more UPS devices to the system and
provide reserve power to selected peripherals. Depending upon how
much of the system is provided with UPS power, it can run a
partial or full workload non-stop through limited periods of AC
power failure.
* The UPS contains a serial I/O communications interface that, in
conjunction with UPS Monitor/iX software, notifies the system
operator of any problems. Like the battery backup hardware that
the UPS devices replace, a system-wide power failure recovery
message is broadcast to all active user terminals and to the
console upon the return of power following a failure. In addition
to console messages, the UPS Monitor/iX software also posts a
variety of status and warning messages to the system log files
which you can review and analyze to evaluate system performance.